Update – the problem was not the video – the problem was what came AFTER the video on a dynamic page, namely, an invocation of ‘blog-in-blog’. That was causing the video not to play in only IE8 or IE9. Whew.
It could be a css issue – I’m not sure what that could be, however, I don’t see anything obvious in the code.
However I need a workaround: we’re trying to list posts within only one category and have the pagination stay within that category. Which is why I used ‘blog in blog”. Is there any way to do this?